CVE-2026-77253 MCP Atlassian - Path Traversal

MCP Atlassian < 0.22.0 contains a path traversal caused by accepting arbitrary local filesystem paths in attachment upload tools, letting remote attackers disclose sensitive files across client-server boundary, exploit requires network access.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Required
EPSS
0.37% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
Information Disclosure, File System Read
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-22

Vendor fix

Update to version 0.22.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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